Funny story I am progressing through right now. A friend of mine(a guitar player) is recording a CD with his band. I expect it to be big. Don't be surprised if this band bursts on the scene big time. I asked him if he could try out a power cord with his Mesa Boogie, so the CD could sound its best. I gave it to him a little over a week before the recording session. He called the next day to say that the cord made an improvement in his sound. Not night and day, but meaningful. Subtle. He recorded, and all went well. He then reinserted his stock cord. After a day or two, he just wasn't happy with his sound. Was it this, that, or the other thing? Was it the mood? Was it him? He couldn't figure it out. Then, he reinserted the cord I gave him. Everything instantly snapped back into the way it should be. It was the cord! A little later, a recording engineer commented on his sound. He asked about the equipment, and looked it over. Nothing seemed any different than anything else he's ever come across. He asked if the amp was hot rodded or whatever. He commented that he couldn't believe the sound coming out of his amp. My friend then told him about the cord. My friend then returned the cord to me, and I gave him another to try. His remarks to me were that he cannot live without a good power cord. He no longer sees the difference as subtle. His impressions are now concrete. Now he NEEDS a power cord. Are we going to start a revolution in pro audio???